Influence of Heating Rate on Morphologies and Magnetic Properties of α-Fe2O3
LI Zi-Yue1, ZHANG Hui-Min1, LIU Li-Hu1,2**, SUN Hui-Yuan1,2
1College of Physics Science and Information Engineering, Hebei Normal University, Shijiazhuang 050024 2Key Laboratory of Advanced Films of Hebei Province, Hebei Normal University, Shijiazhuang 050024
Influence of Heating Rate on Morphologies and Magnetic Properties of α-Fe2O3
LI Zi-Yue1, ZHANG Hui-Min1, LIU Li-Hu1,2**, SUN Hui-Yuan1,2
1College of Physics Science and Information Engineering, Hebei Normal University, Shijiazhuang 050024 2Key Laboratory of Advanced Films of Hebei Province, Hebei Normal University, Shijiazhuang 050024
摘要A variety of hematite microstructures are synthesized through oxalic acid-assisted thermal treatment of iron films sputtered onto glass substrates. Petal-like α-Fe2O3 nanoslices and honeycomb-like α-Fe2O3 particles of micrometer sizes are obtained after annealing at 500°C but with different rates of heating to the final annealing temperature. Structures and morphologies of the samples are studied by means of x-ray diffraction, scanning electron microscopy and atomic force microscopy. These structures are believed to be formed during the period of increasing temperature to the final annealing temperature. Superconducting-quantum-interference-device magnetometer measurements show room-temperature ferromagnetism in these samples.
Abstract：A variety of hematite microstructures are synthesized through oxalic acid-assisted thermal treatment of iron films sputtered onto glass substrates. Petal-like α-Fe2O3 nanoslices and honeycomb-like α-Fe2O3 particles of micrometer sizes are obtained after annealing at 500°C but with different rates of heating to the final annealing temperature. Structures and morphologies of the samples are studied by means of x-ray diffraction, scanning electron microscopy and atomic force microscopy. These structures are believed to be formed during the period of increasing temperature to the final annealing temperature. Superconducting-quantum-interference-device magnetometer measurements show room-temperature ferromagnetism in these samples.
(Magnetic annealing and temperature-hysteresis effects)
引用本文:
LI Zi-Yue1, ZHANG Hui-Min1, LIU Li-Hu1,2**, SUN Hui-Yuan1,2. Influence of Heating Rate on Morphologies and Magnetic Properties of α-Fe2O3[J]. 中国物理快报, 2012, 29(3): 36802-036802.
LI Zi-Yue, ZHANG Hui-Min, LIU Li-Hu, SUN Hui-Yuan. Influence of Heating Rate on Morphologies and Magnetic Properties of α-Fe2O3. Chin. Phys. Lett., 2012, 29(3): 36802-036802.
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